Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0-or-later */
2 : /* fs/ internal definitions
3 : *
4 : * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5 : * Written by David Howells (dhowells@redhat.com)
6 : */
7 :
8 : struct super_block;
9 : struct file_system_type;
10 : struct iomap;
11 : struct iomap_ops;
12 : struct linux_binprm;
13 : struct path;
14 : struct mount;
15 : struct shrink_control;
16 : struct fs_context;
17 : struct pipe_inode_info;
18 : struct iov_iter;
19 : struct mnt_idmap;
20 :
21 : /*
22 : * block/bdev.c
23 : */
24 : #ifdef CONFIG_BLOCK
25 : extern void __init bdev_cache_init(void);
26 :
27 : void emergency_thaw_bdev(struct super_block *sb);
28 : #else
29 : static inline void bdev_cache_init(void)
30 : {
31 : }
32 : static inline int emergency_thaw_bdev(struct super_block *sb)
33 : {
34 : return 0;
35 : }
36 : #endif /* CONFIG_BLOCK */
37 :
38 : /*
39 : * buffer.c
40 : */
41 : int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
42 : get_block_t *get_block, const struct iomap *iomap);
43 :
44 : /*
45 : * char_dev.c
46 : */
47 : extern void __init chrdev_init(void);
48 :
49 : /*
50 : * fs_context.c
51 : */
52 : extern const struct fs_context_operations legacy_fs_context_ops;
53 : extern int parse_monolithic_mount_data(struct fs_context *, void *);
54 : extern void vfs_clean_context(struct fs_context *fc);
55 : extern int finish_clean_context(struct fs_context *fc);
56 :
57 : /*
58 : * namei.c
59 : */
60 : extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
61 : struct path *path, struct path *root);
62 : extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
63 : const char *, unsigned int, struct path *);
64 : int do_rmdir(int dfd, struct filename *name);
65 : int do_unlinkat(int dfd, struct filename *name);
66 : int may_linkat(struct mnt_idmap *idmap, const struct path *link);
67 : int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
68 : struct filename *newname, unsigned int flags);
69 : int do_mkdirat(int dfd, struct filename *name, umode_t mode);
70 : int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
71 : int do_linkat(int olddfd, struct filename *old, int newdfd,
72 : struct filename *new, int flags);
73 :
74 : /*
75 : * namespace.c
76 : */
77 : extern struct vfsmount *lookup_mnt(const struct path *);
78 : extern int finish_automount(struct vfsmount *, const struct path *);
79 :
80 : extern int sb_prepare_remount_readonly(struct super_block *);
81 :
82 : extern void __init mnt_init(void);
83 :
84 : extern int __mnt_want_write_file(struct file *);
85 : extern void __mnt_drop_write_file(struct file *);
86 :
87 : extern void dissolve_on_fput(struct vfsmount *);
88 : extern bool may_mount(void);
89 :
90 : int path_mount(const char *dev_name, struct path *path,
91 : const char *type_page, unsigned long flags, void *data_page);
92 : int path_umount(struct path *path, int flags);
93 :
94 : /*
95 : * fs_struct.c
96 : */
97 : extern void chroot_fs_refs(const struct path *, const struct path *);
98 :
99 : /*
100 : * file_table.c
101 : */
102 : extern struct file *alloc_empty_file(int, const struct cred *);
103 : extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
104 :
105 0 : static inline void put_file_access(struct file *file)
106 : {
107 0 : if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
108 0 : i_readcount_dec(file->f_inode);
109 0 : } else if (file->f_mode & FMODE_WRITER) {
110 0 : put_write_access(file->f_inode);
111 0 : __mnt_drop_write(file->f_path.mnt);
112 : }
113 0 : }
114 :
115 : /*
116 : * super.c
117 : */
118 : extern int reconfigure_super(struct fs_context *);
119 : extern bool trylock_super(struct super_block *sb);
120 : struct super_block *user_get_super(dev_t, bool excl);
121 : void put_super(struct super_block *sb);
122 : extern bool mount_capable(struct fs_context *);
123 : int sb_init_dio_done_wq(struct super_block *sb);
124 :
125 : /*
126 : * open.c
127 : */
128 : struct open_flags {
129 : int open_flag;
130 : umode_t mode;
131 : int acc_mode;
132 : int intent;
133 : int lookup_flags;
134 : };
135 : extern struct file *do_filp_open(int dfd, struct filename *pathname,
136 : const struct open_flags *op);
137 : extern struct file *do_file_open_root(const struct path *,
138 : const char *, const struct open_flags *);
139 : extern struct open_how build_open_how(int flags, umode_t mode);
140 : extern int build_open_flags(const struct open_how *how, struct open_flags *op);
141 : extern struct file *__close_fd_get_file(unsigned int fd);
142 :
143 : long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
144 : int chmod_common(const struct path *path, umode_t mode);
145 : int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
146 : int flag);
147 : int chown_common(const struct path *path, uid_t user, gid_t group);
148 : extern int vfs_open(const struct path *, struct file *);
149 :
150 : /*
151 : * inode.c
152 : */
153 : extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
154 : int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry);
155 : bool in_group_or_capable(struct mnt_idmap *idmap,
156 : const struct inode *inode, vfsgid_t vfsgid);
157 :
158 : /*
159 : * fs-writeback.c
160 : */
161 : extern long get_nr_dirty_inodes(void);
162 : extern int invalidate_inodes(struct super_block *, bool);
163 :
164 : /*
165 : * dcache.c
166 : */
167 : extern int d_set_mounted(struct dentry *dentry);
168 : extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
169 : extern struct dentry *d_alloc_cursor(struct dentry *);
170 : extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
171 : extern char *simple_dname(struct dentry *, char *, int);
172 : extern void dput_to_list(struct dentry *, struct list_head *);
173 : extern void shrink_dentry_list(struct list_head *);
174 :
175 : /*
176 : * pipe.c
177 : */
178 : extern const struct file_operations pipefifo_fops;
179 :
180 : /*
181 : * fs_pin.c
182 : */
183 : extern void group_pin_kill(struct hlist_head *p);
184 : extern void mnt_pin_kill(struct mount *m);
185 :
186 : /*
187 : * fs/nsfs.c
188 : */
189 : extern const struct dentry_operations ns_dentry_operations;
190 :
191 : /*
192 : * fs/stat.c:
193 : */
194 :
195 : int getname_statx_lookup_flags(int flags);
196 : int do_statx(int dfd, struct filename *filename, unsigned int flags,
197 : unsigned int mask, struct statx __user *buffer);
198 :
199 : /*
200 : * fs/splice.c:
201 : */
202 : long splice_file_to_pipe(struct file *in,
203 : struct pipe_inode_info *opipe,
204 : loff_t *offset,
205 : size_t len, unsigned int flags);
206 :
207 : /*
208 : * fs/xattr.c:
209 : */
210 : struct xattr_name {
211 : char name[XATTR_NAME_MAX + 1];
212 : };
213 :
214 : struct xattr_ctx {
215 : /* Value of attribute */
216 : union {
217 : const void __user *cvalue;
218 : void __user *value;
219 : };
220 : void *kvalue;
221 : size_t size;
222 : /* Attribute name */
223 : struct xattr_name *kname;
224 : unsigned int flags;
225 : };
226 :
227 :
228 : ssize_t do_getxattr(struct mnt_idmap *idmap,
229 : struct dentry *d,
230 : struct xattr_ctx *ctx);
231 :
232 : int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
233 : int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
234 : struct xattr_ctx *ctx);
235 : int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode);
236 :
237 : #ifdef CONFIG_FS_POSIX_ACL
238 : int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
239 : const char *acl_name, const void *kvalue, size_t size);
240 : ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
241 : const char *acl_name, void *kvalue, size_t size);
242 : #else
243 : static inline int do_set_acl(struct mnt_idmap *idmap,
244 : struct dentry *dentry, const char *acl_name,
245 : const void *kvalue, size_t size)
246 : {
247 : return -EOPNOTSUPP;
248 : }
249 : static inline ssize_t do_get_acl(struct mnt_idmap *idmap,
250 : struct dentry *dentry, const char *acl_name,
251 : void *kvalue, size_t size)
252 : {
253 : return -EOPNOTSUPP;
254 : }
255 : #endif
256 :
257 : ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);
258 :
259 : /*
260 : * fs/attr.c
261 : */
262 : int setattr_should_drop_sgid(struct mnt_idmap *idmap,
263 : const struct inode *inode);
264 : struct mnt_idmap *alloc_mnt_idmap(struct user_namespace *mnt_userns);
265 : struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap);
266 : void mnt_idmap_put(struct mnt_idmap *idmap);
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